Filter



L. W. WILLIAMS April 7, 1942.

FLTER Filed Nov. l5, 1959 2 Sheets- Sheet l ATTORNEYS APril 7, 1942l L.wlLLlAMs 2,278,603

FILTER Filed NOV. 13, 1939 2. SheeIZS-SheefI 2 lNvEN'ljOR BY I .v n

ATTO RN EY Patented Apr. 7, 1942 orrica' Lewis W. Williams, Short Hills,N. J., assigner to Motor Improvements, Inc., Newark N. J., a corporationof Delaware Application November 13, 1939, Serial No. 303,934

11 Claims.

This invention relates to filters and more especially to iilters for usewith automotive internal combustion engines.

An object of this invention is a highly eicient filtering element whichis simple in structure, has a. large effective surface area in asmallspace, is inexpensive to manufacture and has a long usel ful life.

In its preferred embodiment, an element according to the presentinvention comprises two similar sections of irregular or rough surfacefiltering medium connected at their edges and arranged with theiropposing rough surfaces in contact over at least the major portionthereof. The element is of the outside-in type and passages are providedfor draining filtered oil from the interior thereof. In part at least,the element is shaped to be of cylindrical coniiguration having inwardlyprojecting folds. The two element sections may be disks cut out from asheet of kraft paper impregnated with a phenol-formaldehyde resin such,for example, as Bakelite, or may be circular members molded from paperpulp containing a' phenol-formaldehyde resin. When the element isfabricated from two paper disks, such disks are rst attached togetheralong their peripheries and then are folded into the desired shape andprovided with drainage means. When the element is fabricated from moldedmembers, such members are originally formed of such shape that they haveincipient folds but may be nested together, in which condition they areattached at their peripheries. While still plastic after the two membersare attached together in their original shape, they are formed into theiinal shape of the element and heat treated to set them in such nalshape.

Other objects, novel features and advantages of this invention willbecome apparent from'the following specication and accompanyingdrawings, wherein:

Fig. 1 is a vertical section through a. filter equipped with a filteringunit embodying the invention, such unit being partially broken'away;

Fig. 2 is a top view of a filter unit embodying 4 the invention; I

Fig. 3 is a vertical section substantially on the line 3-3 of Fig. 2;

, Fig. 4 is a section on the line 4-4 of Fig. 3;

Fig. 5 is a section similar to Fig. 3 of a modication;

. Fig. 6 is a section on the line 6-6 of Fig. 5;

Fig. '7 is a perspective view of a molded paper member used in formingthe filter illustrated in Fig. 5, and

` ing inwardly projecting folds I4.

Fig. 8 illustrates a pair of molded members about to be assembled toproduce the illter of Fig. 5.

The filtering element illustrated in Figs. 1 to 4 inclusive consistsessentially of two disks Il and I2 of irregular or rough surface lteringmedium such, for example, as kraft paper connected at their peripheriespreferably by a row of stitches I3. The two disks are shaped to formanelement which is of substantially cup-shape in overall condgurationwith the cylindrical portion hav- The inner edges of the folds definethe outline of a cone and the depth of the folds increases progressivelyupwardly. A wire ring I5 surrounds the upper end of the cylindricalportion of the iiltering element and serves to prevent spreading of theupper end of such portion.

Two Wire mesh disks IB and I1 are arranged between'the disks II and I2in the bottom portion of the element, the disk I6 being of slightlylgreater area than the said bottom portion and having its edge turned toextend into the cylindrical portion and the disk II being not over Lhalf the area of the bottom portion. The disks f flange 23a on thebushing I9, thereby completing the assembly of the drainage tube andalso clamping the drainage tube to the filtering element in liquid-tightrelation. The other end of the bushing I8 is of less interior diameterthan the slotted end and extends into the cylindrical portion oftheelement 10. The Wire mesh disks I6 and I'I form a drainage member forleading liquid through the bottom portion of the element to the slits 22which constitute the outlets for the element. The undulated vportions ofthe disks Il and I2 are in contact throughout substantially theirentireareas and the irregular surfaces thereof form channels throughwhich liquid may flow downwardly to the wire mesh drainage member. Y

In Fig. 1 is illustrated the lterunit above described mounted in acontainer. Such container comprises a base 23 having a hollow boss 24 inthe bottom of which is screwed a vertical post 25.

55 The ltering element I0 surrounds the post 25 the upper boss. A shellor cover 21 has its rim thereof.

with the lower end o f the bushing Il fitting into boss 24 and the upperend 9061i' Il engages the rim of bushing relativetothe fitting into base23 andisheldinassemthe base by a nut 2l having an stem screwed on to thetop of the bushins Il Arib 2. on the bushing the boss 24 to locate the agroove in the bled relation to interiorly threaded of the post 2l.

In the base 23 is provided an inlet 29 communicating with the sumpsurrounding the boss.

24 and an outlet 3l communicating with the interior of the boss 24.Oilto be filtered is supplied to the interior of the filter housingthrough the inlet 22 and fills the entire housing so that comes intocontact with the outer surfaces of both disks II and I2. The snug nt ofthe bushing I2 on the post 2l prevents flow of oil along the surface ofthepost into the interior of the boss 24. Oil passesV inwardly throughboth disks II and I2, and flows therebetween to the apertures 22 throughwhich it flows around the post 25 into the boss 24 and thence outthrough the outlet 3l. The same pressure is exerted by the oil over twodisks `II and I2 so that there is no tendency for compression togetheroftwo folds. The necessary spacing between the disks to permit oil iioyis provided by the irregular surface of the disks and the drainagemembers-in the lower portion of the unit.

In constructing the above-described element from kraft paper, two propersize disks .are laid in contacting relation with the mesh disks I6 andI1 located between the paper disks centrally The wire mesh disks and thepaper disks are interconnected by any suitable temporary fastening meansand the edges of the two disks are then stitched together. Preferably,the

the entire areas of the l two disks are so arranged that the grain ofone disk. The circular two-wall element is then converted into cup-shapeby fashioning an annular section thereof perpendicular to the remainderand simultaneously inwardly projecting sections of the annular portionsto produce a star-shaped arrangement. The drainage tube `is assembledtherewith by punching alned apertures centrally of the bottom portion,projecting the slotted end of the bushing I8 through such apertures andclamping the bushing I8 to the bushing I9 by turning the slotted end ofthe bushing I8 over the flange 23. When it is desired to attach thedrainage tube after the element has been shaped as above described, therim of the cylindrical portion may be spread out sufficiently to affordaccess to the bottom portio'n. Following the attachment of the drainagetube and the arrangement of the element in the star-shaped condition,the wire I5 is placed over the end of the cylindrical portion tomaintainit in such condition. The element is now ready for mounting in thefilter casing as shown in Fig. 1.

Fig. 5 illustrates a filtering element consisting of two members 3I and32 formed of molded paper pulp. The two elements are connected togetherat their peripheries preferably by a row of stitches 33 and are shapedto form an element which is of substantially cup-shape in overallconfiguration with the cylindrical portion having inwardly projectingfolds '34. The folds are of uniform depth and their inner edges deiinethe outline o! acylinder just slightly larger than the diameter of thepost 2l. The wire ring 3l surrounds the upper end of the cylindricalportion of the filtering element and serves to prevent spreadingthereof. The folds terminate above the bottom portion of the element andthe bottom edges oi' such folds slope downwardly to the outer edge ofthe bottom portion of the element. A bushing 32 is provided centrally ofthe bottom portion of the member II and surrounds the tube 2l with asnug liquid-tight nt. Centrally of the bottom portion of the member 32is provideda bushing 3l of larger diameter than the post 2l to provide adrainage passageway around such post.

The members 3| and 32 are originally molded in the shape shown in Fig.7. The members are molded in this form to facilitate removal of themfrom the mold. With they member in the condition shown'in Fig. "l, theinner edges of the folds 34 are substantially perpendicular to thecenterl circular portion and such folds have a decreasing taper towardthe edge of the member. After the members 2| and 32 are removed from themold, they are suitably dried after which the bushings 38 and 39 areattached thereto. Next, a pair of members are nested together and areinterconnected along their peripheries preferably by stitching. Afterbeing thus interconnected, the two members are formed into their finalshape shown in Fig. 5, by the use of suitable dies and the ring 35 isput in place, after which the element is heat treated to set the membersin their final position. Each of the members 3| and 32 is provided witha plurality of small protrusions 40 over the circular portions of suchmembers and the protrusions on the member 32 eifect spacing of the twomembers to facilitate flow of oil toward the outlet, the protrusionsbeing formed in the Amembers at the time the members are molded.

Preferably the material composing the two members II and I2 isimpregnated with Bakelite or other similar polymerized resin havingirreversible thermoplastic characteristics. The paper disks may betreated with a thermoplastic material in the manner disclosed in thepatent to Wells, No. 2,103,572. Preferably, the paper pulp used to moldthe members 3l and 32 has mixed therein a water soluble thermoplasticmaterial which is cured at the time the elements are dried therebyimpregnating the elements with such material.

In a typical filter unit embodying this invention, the members II and I2are l5 -inches in diameter and the outside diameter of the cylindricalportion of the unit is approximately 31/2 inches, there being 16'inwardly projecting folds.4

Each of the members II and I2 is approximately .045 inch thick and isimpregnated 'with Bakelite. The impregnation of the members I I and I2with Bakelite is such that the Bakelite content of the members is 18% byweight.

I claim:

1. A filtering element comprising two contacting disk-shaped layers offiltering material joined at their edges, a sheet of drainage materialof smaller area than said layers between the said layers and arrangedcentrally thereof, an opening through the central part of said sheet andsaid layers, an apertured drainage tube passing through, said opening,and means clamping the layers in contact with the drainage tube,y theaperture in said tube communicating o'nlywith the space `between thelayers of filtering `material in which said drainagesheetis`.eifi'cltnsei,l the ing through the central part of said sheet4and said layers, a tube .passing through said opening and having a portcommunicatingonly with ,the space between the layers of filteringmaterial in which said drainage sheet is enc1osed,'and flanges on saidtube clamping together the inner edges l of said sheet and said layers,the outer edges of the, layers of ltering material out of contact withthe drainage sheet being folded so that the outer edges of the foldsdenne an overall cylindrical structure perpendicular to the plane of.that portion of the element coextensive-with the.

drainage sheet. 3. A ltering element comprising two contact ingdiskshaped layers of filtering material joined at their edges, a sheetof drainage material of smaller area than said layers between the said.

layers and arranged centrally thereof, an opening through the centralpart of said sheet and vsaid layers, a tube passing through said openingand -having a port communicating only with the space between the layersof filtering material in which said drainage sheet is enclosed, andmeans clamping the layers in contact with said tube. the

outer edges of the'layers of filtering material out of contact with thedrainage sheet being folded so that the outer edges of the fold definean overall cylindrical structure perpendicular to the vplane of the,drainage sheet and the depth of the inner portions of the foldsprogressively varies from one end to the other of said cylindrical'structure.

4. A ltering element according to claim 1 characterized by the lteringlayers consisting' of self-supporting irregular surface resinimpregnated paper.

5. A filtering element according to claim 2 characterized by thefiltering layers consisting of self-supporting Virregular surfaceresin-impregnated paper.

6. A filtering element according to ciaim S characterized by filteringlayers consisting of self- `supporting irregular surfaceresin-'impregnated paper. I

'7. A filtering element comprising two contacting disk-shaped layers offiltering material joined at their edges, means spacing said layers forY drainage purposes over central areas of less`ex' tent than saidlayers, an opening through said areas and spacing means, a tube passingthrough said opening'. and having a port communicating .A

only with the's'pace between said central areas, and means clamping saidlayers in contact -with said tube, the outer edges of said layers beyondsaid central areas being folded so that the outer edges ofthe foldsdefine an overall cylindrical structure perpendicular to the plane ofsaid cen-' tral areas.

8. A ltering element according to claim 7 in which the depth of theinner portions of the folds progressively varies from one. end to theother .of the cylindrical structure.

9. A ltering element according to claim 'Il characterized by the depthof the inner portions of the folds being substantially uniform from oneend to the other of said cylindrical structure.

l0. A ltering element according to claim 'I characterized by thefiltering layers consisting of self-supporting irregular surfaceresin-impregnated paper.

11. A ltering element according to claim 'I characterized by the lteringlayers consisting of self-supporting irregular .surfaceresin-impregnated paper and the depth of the'inner portions of the foldsprogressively Varying from one end to-the other of the cylindricalstructure.

LEWIS W. WILLIAMS.

